Slip sheet apparatus



1941- A. POTDEVlN SLIP SHEET APPARATUS Original Filed March, 9,- 1937 ATTORNEYS INVENTOR @4464 m BY V Patented Jan. 28, 1941 PATENT OFFICE sue SHEET APPARATUS Adolph:Potdevi11,. Garden City, N. Y., assignor to Potdevin .Machine Company, Brooklyn, N. Y., a corporation of New York Original application March 9, 1937, Serial No. 129,787. Divided and this application March 29, 1939,.Serial No. 264,692

3 Claims.

This application, which is a division of my copending application Serial No. 129,787, filed March 9, 1937, Patent No. 2,158,552, May 16, 1939, is directed to an improvement in machines for handling material, such as paper, for example, which may be fed in a continuous length into the machine, cut off, printed and collected, my invention being particularly directed to a construction wherein a sheet of material, termed commercially' a slip-sheet, is inserted between adjacent lengths of superimposed printed material to prevent offset printing, that is to say, to prevent the ink on one piece of material being accidentally transferred to an adjacent superimposed length.

The machine is full automatic in operation and capable of operating at high rates of speed.

In the accompanying drawing:

Fig. 1 is a fragmentary elevational view of an embodiment of my invention; and

Fig. 2 is a view taken on the line 22 of Fig. 1.

Referring to the drawing in detail: 2 designates carrier chains adapted to receive bags 4 successively and to carry the bags through the printing mechanism (not shown) where the desired printing is applied to the face of the bags, the bags finally being delivered to a conveyor 6 traveling transversely of the carrier chains 2, this conveyor discharging the bags from the machine.

Spanning the carrier chains 2 at intervals and pivoted therein are gripper-carrying rods 8, each of which carries a plurality of grippers l adapted to grip the leading end of a length of material such as the bags 4, passing through the machine, the material, as illustrated in Fig. 1, being gripped between the grippers l0 and the flattened face of bars l2 carried by the chains and lying parallel with the rods 8. The grippers are spring closed.

The upper reaches of the chains 2 are moving from left to right, as viewed in Fig. 1, and it will be seen from this figure that each rod 8 is provided with a depending opening tail M which is adapted to engage a fixed stop l6 when a set of grippers has reached a position where the bag 4 grippers to close upon the bag under the action of their closing springs. If desired this closing movement of the grippers may be retarded as disclosed in my copending application, above referred to.

As above pointed out, I provide for depositing a slip-sheet upon each bag or other material deposited upon the conveyor 6.

The slip-sheets are pre-cut and are fed into the machine from a stack. The stack of slipsheets is designated 20.

The chains for carrying the slip-sheets to the conveyor 6 are designated 22. These chains are provided at proper intervals with rods 24 carrying grippers 26. The rods 24 are spring-actuated by springs 28 to close the grippers to grip a slipsheet between the gripper jaws and a flattened bar 30 similar to the bars I2.

Each gripper rod is provided with an opening tail 32 adapted, as the chains advance, to engage an opening cam 34. This cam is so located that the grippers are opened at the proper instant to receive the leading end of the slip-sheet being forwarded thereto. Closure of the slip-sheet grippers is retarded by a cam 36 which is adapted to be engaged by a finger 38 with which each gripper rod 24 is provided. The grippers 26 are opened by a cam 40, located so that the slipsheets are released as they come into positionabove the conveyor 6.

The stack 20 of slip-sheets is disposed at one side of and slightly above the grippers and chains and the slip-sheets are picked oil the stack individually by suction nozzles or cups 42.

These nozzles or cups are carried in a suction head at the lower end of a vertically extending tube 44. This tube is provided with a lateral bracket 46, which pivotally mounts a short arm 48. The upper end of the arm or lever 48 is pivotally attached to the free end of a lever 50, while the lower end of the arm or lever 48 is pivotally attached to the free end of a lever 52.

The lever 50 is pivoted on the machine frame at 54 and its free end is in line with the tube 44. A stop 56 at this end of the lever 50 limits the swing of the upper end of the tube 44 to the right,- as viewed in Fig. 1. When the tube is. against the stop, the tube is standing vertically, as shown in full lines in Fig. 1.

The lever 50 is provided with an offset 58, and a coil spring 60 has one end attached to this oifset, the other end of the spring being attached to a lug 62 on the tube 44.

The lever 52 is pivoted to the machine frame by a rock shaft 64, this shaft also carrying a lever 66 which is adapted to be actuated by a cam-controlled rod 68. The cam for actuating the rod 68 is designated 10, and is carried by a rotatable shaft 12. The shaft 12 also carries a cam 14 for actuating an arm 16 which is carred by a rock shaft 18, this shaft also carrying a lever 80. Pivoted to the upper end of this lever is a rod 82 extending toward the tube M, the free end of the rod being bent about the tube.

The shaft 12 carries segmental rollers 84 cooperating with rollers 86 and with rollers 88. These rollers may be driven through any suitable gear train.

It will be apparent from all of th foregoing that upon rotation of the shaft 112 to drive the cams I and M the actuating rod 6'8 will be raised vertically and the rod 82 moved to the right,

to move the suction tube M vertically and swing the cup to the right to the dotted line position shown in 'Fig 1.

In operation, as the cup or suction head 42 is raised by lifting of the tube 4 4, a slip-sheet 99 will be removed from the stack 20 and carried to the right, as viewed in Fig, 1, so that the leading end thereof will enter between the forwarding rollers 88 and the segmental forwarding rollers 84, and these rollers are so timed that at this instant the active surface of the segmental rollers will have rotated into position to effect gripping .of the slip-sheet 90, to advance the same along the inside face of the curved guide 92 which will guide the sheet into position to be picked up, by a gripper 26. The machine is continuously running and the parts are so timed that a gripper 26 will always be in position to engage a slip-sheet as the same is advanced to the chain 22. It will be understood that at the same time bags ,or other printed material are advanced by thechain 2, so that as a printed bag 4 is dropped upon the conveyor 6 a slip-sheet .90 is dropped upon the bag.

Inasmuch as these machines are operated at very high speeds, it is desirable, in order that the bags and slip-sheets may be properly deposited upon the conveyor 8, to provide a kicker arm 94 adapted to be oscillated intoengagement with each slip-sheet as the same is brought into position above the conveyor 6. This kicker arm is mounted on a rod 96 carrying the sprockets for the chains 22, the sprockets being freely rotatable on the rod. The kicker arm may be ,oscillated by a suitable cam such as disclosed in my copending application above referred to so as to effect oscillation of the arm at proper intervals.

It is to-be understood that changes may be effected in the apparatus hereinablove descnibed without departing from the spirit and scope of the invention.

What I claim is:

-1. In a machine of the class described, the combination of a carrier for receiving slip-sheets, forwarding rollers for successively forwarding slip-sheets to the carrier, a. pivoted air nozzle, 21. rodifor raising the nozzle, a cam controlling the rod and a rod for pivoting the nozzle toward the forwarding rollers, and a cam controlling said last-mentioned rod whereby the slip-sheets are lifted successively from a stack and advanced to the forwarding rollers.

2. In a machine of the class described, the combination of a carrier for receiving slip-sheets, forwarding rollers for successively forwarding sl-ip-sheets to the carrier, a vertically extending air tube, an air nozzle carried at the lower end of the same, a rod p-ivotally connected to said air tube and adapted to raise and lower the tube, a cam-controlling said rod, a rod operatively connected to said air tube and having a substantially horizontal movement to swing the air tube and nozzle toward the forwarding rollers, and a cam controlling the last-mentioned rod, whereby the slip-sheets are lifted successively from a stack and advanced to the forwarding rollers,

3. In a machine of the class described, the combination of a carrier for receiving slip-sheets, forwarding rollers for successively forwarding slip-sheets to the said carrier, a pivoted air nozzle, means for raising said nozzle, a cam for controlling said nozzle-raising means, means for pivoting said nozzle, and a cam for controlling said nozzle-pivoting means whereby slip-sheets are lifted individually from a stack of pro-formed sheets and advanced to the forwarding rollers.

ADOLPH POTDEVIN. 

